OK So I sold my 13" cMBP because I hated the weight, no standby feature and slow HDD. I decided to get the 13" MBA because it beats all those things hands down. I was torn about getting 13" rMBP but worried about UI lag, i've done lots of testing at the apple store and even resizing a webpage in safari sometimes isn't smooth. It gives the impression of a slow computer, even though technically speaking it isn't slow. I love this MBA screen brightness, battery life and weight - but I'm getting headaches! This 1440x900 screen just makes things too small. Compared to 1280x800 on the cMBP, things look too small to me. Will i get used to this? Should i live with it and use safari zoom as a compromise? (I mostly do web browsing) Retina screen on 13" would resolve this, I would get back my 1280x800 display ! So worried about being disappointed with the lag though! This MBA flies!